Difference between revisions of "BELK-AN-004: Interfacing BoraEVB/BoraXEVB to TFT LCD display"
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==Enabling frame buffer driver in linux kernel== | ==Enabling frame buffer driver in linux kernel== | ||
To enable frame buffer driver TBD | To enable frame buffer driver TBD | ||
| + | |||
| + | During kernel bootstrap, the following messages are printed out on console, indicating framebuffer driver has been loaded succesfully: | ||
| + | |||
| + | TBD | ||
Once the kernel has completed boot, frame buffer can be accessed from user space applications via <code>/dev/fb0</code> device file (for more details please refer to https://www.kernel.org/doc/Documentation/fb/framebuffer.txt). | Once the kernel has completed boot, frame buffer can be accessed from user space applications via <code>/dev/fb0</code> device file (for more details please refer to https://www.kernel.org/doc/Documentation/fb/framebuffer.txt). | ||
| + | |||
The following image shows Qt 4.??? demo application running on top of it. | The following image shows Qt 4.??? demo application running on top of it. | ||
TBD | TBD | ||
Revision as of 10:43, 1 September 2015
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Contents
History[edit | edit source]
| Version | Date | BELK version | Notes |
|---|---|---|---|
| 1.0.0 | 2.2.0 | First release |
Introduction[edit | edit source]
This application note describes the interfacing of Ampire AM-800480STMQW-TA1 display to BoraEVB. This project is based on BELK 2.2.0.
Physical interfacing[edit | edit source]
To interface the display a small adapter board is needed. It interfaces J22 connector on BoraEVB side and provides a 20-pin connector to directly attach display cable. It is also equipped with a linear regulator generating 2.5V. This voltage is used as power supply for the VDDIO_BANK13 rail. This voltage is required to implement LVDS differential pairs that drive display.
At this URL TBD schematics are available for download.
Block diagram and Vivado design[edit | edit source]
The following picture shows simplified block diagram of the design.
TBD
LCD is driven by a controller implemented in PL that fetches pixel data from frame buffer and periodically refreshes physical screen. LCD controller provides configuration registers that are mapped in the following address range: TBD
To implement frame buffer, a portion of main SDRAM is used. This area is allocated at runtime by linux frame buffer driver.
At the following URL the Vivado design is available for download: TBD.
Enabling frame buffer driver in linux kernel[edit | edit source]
To enable frame buffer driver TBD
During kernel bootstrap, the following messages are printed out on console, indicating framebuffer driver has been loaded succesfully:
TBD
Once the kernel has completed boot, frame buffer can be accessed from user space applications via /dev/fb0 device file (for more details please refer to https://www.kernel.org/doc/Documentation/fb/framebuffer.txt).
The following image shows Qt 4.??? demo application running on top of it. TBD
